← Glossary Morphology petiole The stalk that connects a leaf blade to the stem. Leaves without petioles are called sessile . Plants Using This Term (8) Alliaria petiolata — Garlic Mustard Anubias barteri — Anubias Convallaria majalis — Lily of the Valley Hesperis matronalis — Dame's Rocket Prunus virginiana — Chokecherry Rhamnus cathartica — Common Buckthorn Toxicodendron pubescens — Atlantic Poison Oak Viola sororia — Common Blue Violet Related Terms achene acuminate aerial root alternate annual axillary basal berry biennial bract calyx capsule cauline clasping cordate corolla corymb crenate cyme cypsela deciduous dentate drupe entire evergreen fenestration follicle glaucous inflorescence lanceolate legume ligulate lobed opposite ovary palmate panicle papilionaceous pappus pedicel perennial pinnate pubescent raceme rachis rhizome rosette sepal serrate sessile silique spadix spathe spatulate stamen stipule succulent taproot ternate thallus trifoliate umbel undulate whorled